---
title: kCGImagePropertyGPSAltitudeRef
framework: imageio
role: symbol
role_heading: Global Variable
path: imageio/kcgimagepropertygpsaltituderef
---

# kCGImagePropertyGPSAltitudeRef

The altitude point of reference.

## Declaration

```swift
let kCGImagePropertyGPSAltitudeRef: CFString
```

## See Also

### GPS Coordinate

- [kCGImagePropertyGPSLatitude](imageio/kcgimagepropertygpslatitude.md)
- [kCGImagePropertyGPSLongitude](imageio/kcgimagepropertygpslongitude.md)
- [kCGImagePropertyGPSAltitude](imageio/kcgimagepropertygpsaltitude.md)
- [kCGImagePropertyGPSLatitudeRef](imageio/kcgimagepropertygpslatituderef.md)
- [kCGImagePropertyGPSLongitudeRef](imageio/kcgimagepropertygpslongituderef.md)
- [kCGImagePropertyGPSHPositioningError](imageio/kcgimagepropertygpshpositioningerror.md)